249474878 has 16 divisors (see below), whose sum is σ = 387542880. Its totient is φ = 120303456.

The previous prime is 249474877. The next prime is 249474889. The reversal of 249474878 is 878474942.

It is a super-2 number, since 2×249474878² = 124475429506229768, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249474877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69176 + ... + 72692.

It is an arithmetic number, because the mean of its divisors is an integer number (24221430).

Almost surely, 2^249474878 is an apocalyptic number.

249474878 is a deficient number, since it is larger than the sum of its proper divisors (138068002).

249474878 is a wasteful number, since it uses less digits than its factorization.

249474878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771.

The product of its digits is 3612672, while the sum is 53.

The square root of 249474878 is about 15794.7737558979. The cubic root of 249474878 is about 629.5191409214.

The spelling of 249474878 in words is "two hundred forty-nine million, four hundred seventy-four thousand, eight hundred seventy-eight".